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Updated: Jun 3, 2026

Formation of Dispersible Taohong Siwu Tablets
Published on: February 3, 2023
Key formulation variables in tableting of coated pellets.
V S N Murthy Dwibhashyam1, J Vijaya Ratna
1TherDose Pharma Pvt. Ltd, Plot No: 30-32, Survey No: 400, 1st Floor, Prashanth Nagar, IE, Kukatpally, Hyderabad-500 072, India.
Formulating controlled-release tablets from coated pellets requires careful optimization of pellet properties and excipient selection. Key factors include pellet porosity, density, and coating characteristics, alongside excipient cushioning effects for successful compression.
Area of Science:
- Pharmaceutical Sciences
- Drug Delivery Systems
Background:
- Multiple unit controlled-release dosage forms offer advantages over single-unit forms due to uniform gastrointestinal distribution.
- Tablet formulation is preferred for coated pellets, but compression presents significant challenges.
Purpose of the Study:
- To identify critical formulation and process variables for successful compression of coated pellets into tablets.
- To optimize the properties of both pellets and tableting excipients for robust tablet manufacturing.
Main Methods:
- Investigated the impact of pellet composition, porosity, size, shape, and density on compressibility.
- Evaluated the role of polymer coating type, thickness, and solvent system (solvent-based vs. aqueous-based).
- Assessed the influence of tableting excipient properties, including cushioning, size, and density, on tablet quality.
Main Results:
- Pellet core strength, plasticity, high porosity, small size, and irregular shape are crucial.
- Optimal pellet density for prolonged release is between 2.4 and 2.8 g/cm³.
- Acrylic polymer films, thicker coatings, and solvent-based coatings enhance mechanical stability during compression.
- Excipients with cushioning properties and similar size/density to pellets prevent segregation and coat damage.
- Incorporating 30%-60% tableting excipients is necessary to maintain coat integrity and function.
Conclusions:
- Successful compression of coated pellets into tablets depends on optimizing pellet characteristics (porosity, density, shape) and coating properties (flexibility, thickness, stability).
- Careful selection of tableting excipients with cushioning properties and appropriate physical characteristics is essential to prevent damage to the controlled-release coating.
- Optimized formulations ensure the integrity of the multiparticulates, preserving their drug release functionality within the final tablet dosage form.
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